Perhaps the most well known festival of India, Diwali is celebrated all over India with varying degrees of devotion and fervor! Check out here if you want to know more http://en.wikipedia.org/wiki/Diwali

President's message and video below " US President Barack Obama greets people on Diwali". "The flame of the diya, or lamp, reminds us that light will ultimately triumph over darkness," Obama said in his Diwali message yesterday. "Here in the US, Diwali also reminds us that our nation is home to many faiths and traditions, and that our diversity makes us stronger, which I why I'm proud that this year Democrats and Republicans in Congress joined together for the first-ever celebration of Diwali on Capitol Hill," he said.